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    <style>
        ul{
            list-style-type: none;/*去掉图标*/
            overflow: hidden;/*解决子元素全部浮动 高度为0导致的显示异常*/
        }
        li{
            float: left;
            margin-right: 30px;
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        #d1{
            width: 200px;
            height: 100px;
            background-color: red;
        }
        #big{
            width: 1000px;
            background-color: blue;
            margin: 0 auto;/*让块级元素居中*/
        }
        #big>div{
            width: 250px;
            text-align: center;
            float: left;
        }
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